I stand corrected, it does look black now.
I thought I saw a deep blue shade.
A lot has been written about colours and how we perceive them. Even the ambient lighting can influence what you see. I was not doubting whether it is bluish. I can only tell what I saw and I looked a few times, because at first I thought to have seen a bluish tinge as well.
Look like something was printed on Her Majesty's Head,
The I.R. of the overprint.